Verified Answer :

AL2006


You said                                       D = vt+ (1/2)at²

Multiply each side by  2 :           2D = 2vt + at²

Subtract  at²  from each side :   2D - at² = 2vt

Divide each side by  2t :           v = (2D - at²) / 2t

                                                 v = D/t - at/2

first multiply each side by 2
then subtract  at²  from each side
Divide each side by  2t :         

        v = D/t - at/2

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